Baryon Number Changing Currents*)

An attempt is made to generalize the algebra of currents by inclusion of baryon number changing currents which connect baryons and mesons. In this algebra both baryons and mesons are grouped together in a representation, i.e. in a supermultiplet. The currents are constructed from a set of fundamental particles consisting of a spinor SU(3) triplet and a scalar triplet. Most of the important hadrons are included in a supermultiplet but the baryon decimet is not. The hadrons discussed here correspond to bare hadrons without the Yukawa interactions. Mass relations, cross sections and other consequences obtained from this sym-metry scheme ar.e discussed. The internal symmetry concept in nuclear physics was first introduced in 1932 when the proton and neutron were regarded as an isodoublet, a two component spinor of group SU(2). The group was then extended to SU(3) by inclusion of the lambda particle as a fundamental particle.l) In this symmetry